I'm not sure what happened to my Tello, but I tried to take off the other day and it just flipped over before actually getting airborne. One of the propellers disappeared when the drone hit the ground, so I ordered a replacement set of blades thinking that was the problem. I have tried a bunch of different blades at this point, but no matter what I try, the Tello just flips over when I try to take off. All four propellers are spinning when it tries to take off.